Salvation in Roman Catholicism is a process. To begin, God grants actual grace to a person which enables him to believe in Christ (CCC 2000) and also believe in the truth of the Catholic Church (CCC 1814). After belief, the person must be baptized, which is necessary for salvation (CCC 1257). This baptism erases original sin (CCC 405), unites the person with Christ (CCC 977), infuses grace into the person (CCC 1999), and grants justification (CCC 1992, 2020). After baptism, he is saved. But, to maintain his salvation, it is necessary for him to perform good works (CCC 2010, 2068, 2080) and participate in the sacraments (CCC 1129) which provide the grace that is “proper to each sacrament” (CCC 1129, 2003). This is necessary in order to maintain infused grace (CCC 987, 1468). However, grace can be lessened by venial sins or completely lost by mortal sins. Venial sins (CCC 1862) remove part of the infused grace but not the saving grace known as sanctifying grace (CCC 1863). To remedy the problem of venial sins, the Catholic is to take the Eucharist which the Church teaches forgives venial sins (CCC 1416). He must also perform various penance which must be done in concert with perfect contrition (CCC 1452). But there is a problem. Sins require punishment. Even though sins are absolved by a priest (CCC 1463, 1495) the punishment due to a person because of his sin can remain. To deal with that remaining punishment, indulgences are administered to deal with the punishment due to the guilt of the sins already forgiven (CCC 1471, 1498). These indulgences draw upon the “good works of the Blessed Virgin Mary” (CCC 1477) and “of Christ and the saints” so as to obtain “the remission of the temporal punishment due for their sins” (CCC 1478). Furthermore, indulgences can be applied to themselves or the dead (CCC 1471) who are in purgatory (CCC 1498). Now, in case the Catholic has committed a mortal sin, then all his infused grace is lost. To regain this grace, he must partake of special penance (CCC 980) since it helps restore grace that was lost (CCC 1468, 1496). To conclude, the Roman Catholic must have faith, participate in the sacraments, take the Eucharist, keep the commandments, perform penance, and do indulgences in order to attain, maintain, and regain his salvation as well as reduce the punishment due to him for the sins of which he has already forgiven.

• 405 – Although it is proper to each individual, original sin does not have the character of a personal fault in any of Adam’s descendants. It is a deprivation of original holiness and justice, but human nature has not been totally corrupted: it is wounded in the natural powers proper to it, subject to ignorance, suffering and the dominion of death, and inclined to sin – an inclination to evil that is called concupiscence”. Baptism, by imparting the life of Christ’s grace, erases original sin and turns a man back towards God, but the consequences for nature, weakened and inclined to evil, persist in man and summon him to spiritual battle.
• 977 – Our Lord tied the forgiveness of sins to faith and Baptism: “Go into all the world and preach the gospel to the whole creation. He who believes and is baptized will be saved.” Baptism is the first and chief sacrament of forgiveness of sins because it unites us with Christ, who died for our sins and rose for our justification, so that “we too might walk in newness of life.”
• 980 – It is through the sacrament of Penance that the baptized can be reconciled with God and with the Church: Penance has rightly been called by the holy Fathers “a laborious kind of baptism.” This sacrament of Penance is necessary for salvation for those who have fallen after Baptism, just as Baptism is necessary for salvation for those who have not yet been reborn.
• 987 – “In the forgiveness of sins, both priests and sacraments are instruments which our Lord Jesus Christ, the only author and liberal giver of salvation, wills to use in order to efface our sins and give us the grace of justification” (Roman Catechism, I, 11, 6).
• 1129 – The Church affirms that for believers the sacraments of the New Covenant are necessary for salvation. “Sacramental grace” is the grace of the Holy Spirit, given by Christ and proper to each sacrament. The Spirit heals and transforms those who receive him by conforming them to the Son of God. The fruit of the sacramental life is that the Spirit of adoption makes the faithful partakers in the divine nature by uniting them in a living union with the only Son, the Savior.
• 1257 – The Lord himself affirms that Baptism is necessary for salvation. He also commands his disciples to proclaim the Gospel to all nations and to baptize them. Baptism is necessary for salvation for those to whom the Gospel has been proclaimed and who have had the possibility of asking for this sacrament. The Church does not know of any means other than Baptism that assures entry into eternal beatitude; this is why she takes care not to neglect the mission she has received from the Lord to see that all who can be baptized are “reborn of water and the Spirit.” God has bound salvation to the sacrament of Baptism, but he himself is not bound by his sacraments.
• 1416 – Communion with the Body and Blood of Christ increases the communicant’s union with the Lord, forgives his venial sins, and preserves him from grave sins. Since receiving this sacrament strengthens the bonds of charity between the communicant and Christ, it also reinforces the unity of the Church as the Mystical Body of Christ.
• 1452 – When it arises from a love by which God is loved above all else, contrition is called “perfect” (contrition of charity). Such contrition remits venial sins; it also obtains forgiveness of mortal sins if it includes the firm resolution to have recourse to sacramental confession as soon as possible.
• 1463 – Certain particularly grave sins incur ex-communication, the most severe ecclesiastical penalty, which impedes the reception of the sacraments and the exercise of certain ecclesiastical acts, and for which absolution consequently cannot be granted, according to canon law, except by the Pope, the bishop of the place or priests authorized by them. In danger of death any priest, even if deprived of faculties for hearing confessions, can absolve from every sin and ex-communication.
• 1468 – “The whole power of the sacrament of Penance consists in restoring us to God’s grace and joining us with him in an intimate friendship.” Reconciliation with God is thus the purpose and effect of this sacrament. For those who receive the sacrament of Penance with contrite heart and religious disposition, reconciliation “is usually followed by peace and serenity of conscience with strong spiritual consolation.” Indeed the sacrament of Reconciliation with God brings about a true “spiritual resurrection,” restoration of the dignity and blessings of the life of the children of God, of which the most precious is friendship with God.
• 1471 – The doctrine and practice of indulgences in the Church are closely linked to the effects of the sacrament of Penance. What is an indulgence? “An indulgence is a remission before God of the temporal punishment due to sins whose guilt has already been forgiven, which the faithful Christian who is duly disposed gains under certain prescribed conditions through the action of the Church which, as the minister of redemption, dispenses and applies with authority the treasury of the satisfactions of Christ and the saints.” “An indulgence is partial or plenary according as it removes either part or all of the temporal punishment due to sin.” The faithful can gain indulgences for themselves or apply them to the dead.
• 1477 – “This treasury includes as well the prayers and good works of the Blessed Virgin Mary. They are truly immense, unfathomable, and even pristine in their value before God. In the treasury, too, are the prayers and good works of all the saints, all those who have followed in the footsteps of Christ the Lord and by his grace have made their lives holy and carried out the mission in the unity of the Mystical Body.”
• 1478 – An indulgence is obtained through the Church who, by virtue of the power of binding and loosing granted her by Christ Jesus, intervenes in favor of individual Christians and opens for them the treasury of the merits of Christ and the saints to obtain from the Father of mercies the remission of the temporal punishments due for their sins. Thus the Church does not want simply to come to the aid of these Christians, but also to spur them to works of devotion, penance, and charity.
• 1495 – Only priests who have received the faculty of absolving from the authority of the Church can forgive sins in the name of Christ.
• 1496 – The spiritual effects of the sacrament of Penance are: – reconciliation with God by which the penitent recovers grace; – reconciliation with the Church; – remission of the eternal punishment incurred by mortal sins; – remission, at least in part, of temporal punishments resulting from sin; – peace and serenity of conscience, and spiritual consolation; – an increase of spiritual strength for the Christian battle.
• 1498 – Through indulgences the faithful can obtain the remission of temporal punishment resulting from sin for themselves and also for the souls in Purgatory.
• 1814 – Faith is the theological virtue by which we believe in God and believe all that he has said and revealed to us, and that Holy Church proposes for our belief, because he is truth itself. By faith “man freely commits his entire self to God.” For this reason, the believer seeks to know and do God’s will. “The righteous shall live by faith.” Living faith “work[s] through charity.”
• 1862 – One commits venial sin when, in a less serious matter, he does not observe the standard prescribed by the moral law, or when he disobeys the moral law in a grave matter, but without full knowledge or without complete consent.
• 1863 – Venial sin weakens charity; it manifests a disordered affection for created goods; it impedes the soul’s progress in the exercise of the virtues and the practice of the moral good; it merits temporal punishment. Deliberate and unrepented venial sin disposes us little by little to commit mortal sin. However venial sin does not break the covenant with God. With God’s grace it is humanly reparable. “Venial sin does not deprive the sinner of sanctifying grace, friendship with God, charity, and consequently eternal happiness.” While he is in the flesh, man cannot help but have at least some light sins. But do not despise these sins which we call “light”: if you take them for light when you weigh them, tremble when you count them. A number of light objects make a great mass; a number of drops fill a river; a number of grains make a heap. What then is our hope? Above all, confession.
• 1992 – Justification has been merited for us by the Passion of Christ who offered himself on the cross as a living victim, holy and pleasing to God, and whose blood has become the instrument of atonement for the sins of all men. Justification is conferred in Baptism, the sacrament of faith. It conforms us to the righteousness of God, who makes us inwardly just by the power of his mercy. Its purpose is the glory of God and of Christ, and the gift of eternal life: But now the righteousness of God has been manifested apart from law, although the law and the prophets bear witness to it, the righteousness of God through faith in Jesus Christ for all who believe. For there is no distinction: since all have sinned and fall short of the glory of God, they are justified by his grace as a gift, through the redemption which is in Christ Jesus, whom God put forward as an expiation by his blood, to be received by faith. This was to show God’s righteousness, because in his divine forbearance he had passed over former sins; it was to prove at the present time that he himself is righteous and that he justifies him who has faith in Jesus.
• 1999 – The grace of Christ is the gratuitous gift that God makes to us of his own life, infused by the Holy Spirit into our soul to heal it of sin and to sanctify it. It is the sanctifying or deifying grace received in Baptism. It is in us the source of the work of sanctification: Therefore if anyone is in Christ, he is a new creation; the old has passed away, behold, the new has come. All this is from God, who through Christ reconciled us to himself.
• 2000 – Sanctifying grace is a habitual gift, a stable and supernatural disposition that perfects the soul itself to enable it to live with God, to act by his love. Habitual grace, the permanent disposition to live and act in keeping with God’s call, is distinguished from actual graces which refer to God’s interventions, whether at the beginning of conversion or in the course of the work of sanctification.
• 2003 – Grace is first and foremost the gift of the Spirit who justifies and sanctifies us. But grace also includes the gifts that the Spirit grants us to associate us with his work, to enable us to collaborate in the salvation of others and in the growth of the Body of Christ, the Church. There are sacramental graces, gifts proper to the different sacraments. There are furthermore special graces, also called charisms after the Greek term used by St. Paul and meaning “favor,” “gratuitous gift,” “benefit.” Whatever their character – sometimes it is extraordinary, such as the gift of miracles or of tongues – charisms are oriented toward sanctifying grace and are intended for the common good of the Church. They are at the service of charity which builds up the Church.
• 2010 – Since the initiative belongs to God in the order of grace, no one can merit the initial grace of forgiveness and justification, at the beginning of conversion. Moved by the Holy Spirit and by charity, we can then merit for ourselves and for others the graces needed for our sanctification, for the increase of grace and charity, and for the attainment of eternal life. Even temporal goods like health and friendship can be merited in accordance with God’s wisdom. These graces and goods are the object of Christian prayer. Prayer attends to the grace we need for meritorious actions.
• 2020 – Justification has been merited for us by the Passion of Christ. It is granted us through Baptism. It conforms us to the righteousness of God, who justifies us. It has for its goal the glory of God and of Christ, and the gift of eternal life. It is the most excellent work of God’s mercy.
• 2068 – The Council of Trent teaches that the Ten Commandments are obligatory for Christians and that the justified man is still bound to keep them; the Second Vatican Council confirms: “The bishops, successors of the apostles, receive from the Lord . . . the mission of teaching all peoples, and of preaching the Gospel to every creature, so that all men may attain salvation through faith, Baptism and the observance of the Commandments.”
• 2080  – The Decalogue contains a privileged expression of the natural law. It is made known to us by divine revelation and by human reason.